"We believe that the public should be properly consulted about the future structure of their local police force.

"Mergers should not proceed unless there is independent evidence that the benefits clearly outweigh the costs, and local people have endorsed the changes in a referendum."

'Bribe' accusation

Together with another set of amalgamations announced earlier this month, the plans would reduce the number of forces in England and Wales to 24.

A decision on mergers has yet to be made in the South West and in the Yorkshire and Humber region, but if mergers set out by the Home Office in November are followed, England and Wales would be left with 17 forces.

The Association of Police Authorities had accused ministers of trying to "bribe" forces into submission by offering extra cash to those who submit merger plans quickly.

In an unprecedented revolt in December, the police authorities ignored a deadline set by the home secretary to submit detailed plans for the mergers.